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D( Y )
Y = 0
Y = 0
Y = 0
Y in (-oo:0) U (0:+oo)
(30/Y)*(20/Y) = 19 // - 19
(30/Y)*(20/Y)-19 = 0
600*Y^-2 = 19 // : 600
Y^-2 = 19/600
-2 < 0
1/(Y^2) = 19/600 // * Y^2
1 = 19/600*Y^2 // : 19/600
600/19 = Y^2
Y^2 = 600/19 // ^ 1/2
abs(Y) = (600/19)^(1/2)
Y = (600/19)^(1/2) or Y = -(600/19)^(1/2)
Y in { (600/19)^(1/2), -(600/19)^(1/2) }
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